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Patented July 20, 1869.

lo. N. HART. HotfAr Furnace.

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A tama ama ORANGE N. HART, or WINoNA, MNNEsorA.

Letters Patent No.' 92,822, dated July 20, 1869.

HOT-AIR FURNAC'...

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern:

Be it known that I, ORANGEN. HART, of Winona, in the county of Winona, and State of Minnesota, have invented certain new and useful Improvements iu Hot-Air Furnaces for heating buildings and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, making part of this specification, and to the letters of reference marked thereon, like letters indicating like parts wherever they occur.

To enable others skilled in the art to construct and use my invention, I will proceed to describe it.

My invention relates Vto hot-air furnaces for heating buildings; and consists in the novel construction and arrangement of the fire-box and smoke-fines, whereby I obtain a large radiating surface; of the gas-burning apparatus, by which it is adapted to burning various lkinds of fuel; also in placing deiiectors, to direct the air in and among thesmoke-iiues,v and in several minor details, all as hereinafter described.

Figure 1 is a longitudinal vertical section through the centre of my furnace. Figure 2, a vertical cross-section on the line x x of g. 1. I f

I construct a castiron fire-box, A, ofthe form shown in the drawings, and of any suitable size, and locate in it, at one end, the `fire-grate a, and provide a large door, G, opening into the fire-box above the grate,

and a small door, h, provided with and opening into the ash-pit, O, below the grate, all as shown in fig. 1.

l cross the fire-box, immediately in the rear of the grate, I locate a gas-burning-device, M, resting on the ledges d, and along the upper sides of the grate a, place fire-plates S, to prevent the case nom being burned out, and so as to admit the passage of air up behind them.

Back of the gas-burning device, I locate removable plates J J, resting on the ledges d, so as to extend from the gas-burner to the back end of the furnace, and divide oii from the fire-box A, a cold-air chamber T. This cold-air chamber T is separated from the ashpit by a vertical plate, P, and receives air through a pipe, K-

'lhegas-burner isof the form of an invertedV, with its lower side communicating with the cold-air chamber T, and is provided with a ne slit'or opening along its upper edge, as shown in iig. 1.

At the back end of the re-box, I provide an escapeflue, W, for the passage of the iame and smoke. Y This flue increases in width from the flre-box upward, and is of about twice the width of the fire-box at-its widest part. l

At the centre of this iue, I place a V-shaped diaphragm, L, to divide the ascending flames.

On top of the flue W, I locate a rectangular drum, C, open at its lower side, and divided at its middle by a horizontal partition, l).

On top of the front end of the iire-box A, I place another rectangular drum, E, provided in its fr ont with a large opening, illed by a hollow iron door or drawer, U, as shown in fig. 1.

The drums C and E, I connect by a series of horizontal flues or pipes, B B', twenty or more in number.

In the drum O, the lower ilues B open below the partition D, and the upper series, B', above the partition, as shown in figml. v

The furnace thus constructed, I surround on four sides with brick-work, leavinga space of about an inch between the walls and the sides of the drums, and provide the doors and the opening filled by 'U with projecting anges extendingthrough the brickwalls in the usualmanner, so that access may be had from the outside. A

On the inside of the brick-work, a little below the lower ues B, I secure inwardly-projecting plates R, inclning upward from their outer to their inner edges,

as shown in-fig. 2. These platesI extend along `both sides and across the back end of the furnace. v

When the furnacev is situated where the air is very flame pass back over the gas-burner M, and meeting at the orifice of said burnera current of fresh air from the chamber T, which, uniting with the gas, increases its combustion.

The flame and smoke pass along tothe back of thek fire-box, and up through flue M (being divided or spread in their ascent by the diaphragm L,) into the lower portion of the drum C, when they are stopped by partition D, and caused to pass back through ilues B to the drum E, and from thence along through the .dues B', to the upper portion of drum C, and into the stack F, the red arrows on the drawing indicating the course of the smoke, and the blue arrows that' of the -ai The course of the air to be heated is indicated by the blue arrows in iig. 2, entering near the base, and ascending in contact with thefre-box, and passing-np around the drums and dues, and'out at the top, whence it may be conveyed, in suitable pipes, wherever required.

The ascending air, next the walls, strikes against the plates It, and is directed inward among the dues, thus insuringits being thoroughly heated.

When short wood or coal is to be used as fuel, the 'gas-burner is arranged as shown in the drawing, but

wheulonger Wood is used, the burner is moved back,

and placed between the plates J and J', the plate' J Ibeing' moved forward against the gr te; or, when necessary, as in using very long Wood, may be placed back of bothv plates, thus always letting in the cold air just where the a-Ineleaves the fuel, it being necessary, when 'the gas-burner is moved back, to add additional re-plates S. Or, if preferred, additional sections of grate-bars may be substituted for the plates in front of the gas-burner, when the latter is moved back. i

By removing the hollowv drawer U, access is had to the open ends of all the fines, which may be readily cleaned by inserting proper instruments through the opening.

A furnace constructed in this manner, presents a very large radiating surface, will burn various sizes and kinds of fuel, and is so arranged that-all of its parts maybe easily reached for cleaning.

VitneSSeS:

WM. W. BILLsoN, C. L. GILMAN. 

